Вычислите: \(\frac{9}{10}+\frac{4}{9}:\left(2-1\frac{11}{21}\right)-1\frac{2}{3}\)

\(\frac{9}{10}+\frac{4}{9}:\left(\frac{42}{21}-\frac{32}{21}\right)-\frac{5}{3}\)
\(\frac{9}{10}+\frac{4}{9}:\frac{10}{21}-\frac{5}{3}\)
\(\frac{9}{10}+\frac{4}{9}\times\frac{21}{10}-\frac{5}{3}\)
\(\frac{9}{10}+\frac{14}{15}-\frac{5}{3}\)
\(\frac{27}{30}+\frac{28}{30}-\frac{50}{30}\)
\(\frac{55-50}{30}=\frac{5}{30}=\frac{1}{6}\)